Traffic cameras showed the helicopter tied to a bulkhead on the side of the river, supported by flotation devices.

The city's emergency management system blasted out an email warning people to expect road closures and a heavy emergency presence in the area of 12th Avenue and West 34th Street. No additional information was immediately available. -NBC New York

BREAKING:
First images of the helicopter that went down in the Hudson near 12th and 30th coming in now. pic.twitter.com/qHVn97ZmQg